Support for sound record films



. I Sept. 9, 1941-. D. STERN 2,255,232

SUPPORT FOR SOUND RECORD FILMS Filed Aug. 1, 1940 INVENTOR 2445527 A JTER/V.

ATTORNEY having a spliced portion therein.

Patented Sept. 9, 194 1 SUPPORT FOR SOUNDBECOBD FILMS Albert D. Stern, Jamaica Estates, Long Island, N. 'Y., assignor to Recordgraph Corporation, New York, N. Y., a corporation of Delaware.

Application August 1, 19 10, Serial No, 349,145

2 Claims.

This invention relates to a supportv fora film An object of the invention is to prevent the splice from causing an objectionable noise in the loud speaker when it passes under the reproducing stylus. A feature of the invention consists 'in the provision of a stationary suppori'rover which the film passes and adjacent which is mounted the reproducing stylus. The supportjis provided with spliced portion of the'fllm but not greater than twice such width. The groove extends across the' support and provides an unsupported area beneath the stylus I. Its length .is at least as great as that portion of the filni upon which recordings are made. lnflii'igure z the full lines show the spliced portion of the film slightly depressed gmder the weight ofthe' stylus and its a transverse groove providingf n unsupported' area beneath thestylus.

Further features and details of construction. will be better understood from a considerationof the following description and claims when, taken in connection with the accompanying drawing in which:

Figure 1 is a perspective view of a support for I the film, a portion of the film and-the stylus; and Figure 2 is a very much enlarged elevation,

' the support being shown brokenaway.

In the usual lap splice the thickness of the Y splice is usually double or more the thickness of the remaining portion of the film. 1

when the stylus strikes thesplice it has a tendency to jump. due to this sudden increase in support. In saidfigure' the dot and dash lines I show the position the film would take if-it were not depressed.

Lap splices rangein width from of an inch 110% of an inch. By making the groove somethickness. As a result of these sudden changes in thicknessthe stylus first bounces out of the I sound track, alights on the film and bounces again one-or two .times until itcomes to rest. Such action causes a click or thud in the loud speaker as the reproducing stylus passes over the splice. V

, Referring to the drawing, i indicates a stationary support having a curved surface over which the film 2 passes? Rollers 4 guide the film in its =passage over the cylindrical portion of the support. The film adapted to be used in the present] invention is a continuous film, that is to say, its ends are spliced together and in Figure 2, the spliced portion of the film is shown at 5. The support I is provided with a transverse groove 6 which is preferably wider than the width of the greater than twice such what greater than the width of the splice, -lt has been found that the mile due to, the splice passing beneath the stylus ia-very effectively reduced, if not entirely eliminated.

If the unsupported area beneath the stylus too wide it leaves the film too free to sway under the load. If such unsupported area is too narrow it does not sufiiciently suppress the splice noise "since there is not room for the spliced area to recede under the stylus pressure. It has also been found that if the width of the unsupported area exceeds the splice width by one-eighth of an inch, good results are also obtained.

What I claim is:

1. In a sound reproducing device in' which a p d g stylus cooperates with a sound rec-. ord film support for a spliced sound record film over which support the film is fed, said support provided with a, transverse groove of a width greater than the width of the splice but not greater than-twice such width.

-2. In asound reproducing device in whlcha reproducing stylus cooperates with a sound record film stationary support of hard material over which a sound record film is adapted to be fed, said film having a spliced portion therein, said support having atransverse groove therein of a width greater than the width of the splice but not width;

ALBERT D. STERN. 

